Knob attachment



R T A 0 M E m m Y N GM H M n l m d 0 H o m H No. 496,576. Patented May2, 1893.

U ITED STATES PATENT OFFICE.

JOSEPH P. MAGNEY AND RUFUS L. CATE, OF SAN FRANCISCO, CALIFORNIA.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 496,576, dated May 2,1893.

Application filed July 8, 1892.

To all whom it may concern.-

Be it known that we, JOSEPH P. MAGNEY and RUFUS L. CATE, citizens of theUnited States of America, residing at San Francisco, in the county ofSan Francisco and State of California, have invented certain new anduseful Improvements in Door Knobs and Spindles, of which the followingis a specification.

Our invention relates particularly to the connections between the knoband the spindle of a door latch.

The object sought to be accomplished is, first, to avoid the use of, ascrew or any other part for holding the knob to the spindle, removablein use and liable to work loose; to provide a secure, easily connectedand disconnected fastening; to avoid complication of parts; and torender the knob adjustable for doors of diiferent thickness, or forshrinkage.

Our invention is hereinafter described, and illustratedin theaccompanying drawings, in which:

Figure 1-shows a longitudinal section along the spindle; Fig. 2-atransverse section on line a;x of Fig. 1. Fig. 3is a detail perspectiveview of the locking parts detached.

In the drawings A represents the knob, and B the spindle of a doorlatch, these being of any construction. The shank of the knob A is shownin longitudinal section at cl. It is provided with the ordinary axialhole to receive the spindle. A transverse hole is tapped into this shankopening from the outside to the interior. In this is set a thimblee,which is threaded on the outside and fits the threads in the hole.Within this thimble is a spring catch, or bolt, which engages, when thethimble is in place, with holes or notches in the spindle. The thimbleis used simplyfor convenience of construction, and to hold the lockingspring catch or bolt, in the shank, but this is not essential to theprincipal part of our invention. The thimble is shown at 6. Its interioris cylindrical, opening from the lower end. The upper end is partiallyclosed, having only a central opening. lVithin the thimble is placed thecatch g. This we prefer Serial No. 439,357- (No model.)

to make in .the form shown, which is that of a disk, which fits the boreof the thimble, provided with a rectangular rib vi on this lower facewhich fits into the transverse kerfs k, in the spindle. On the upperside of the disk is a stem m, which projects through the hole in theupper part of the thimble. This is provided with a cap, 07., on oppositesides of which are small studs which fit into a kerf 0, made centrallyacross the top of the thimble. When the catch is in a kerf or hole inthe spindle, the cap is down on the top of the thimble, with the studsin the kerf of the thimble. This locks the thimble and prevents it fromturning out. Between the disks and the top of the thimble is a coiledspring placed around the stem, and held in place, by the cap on thestem, which secures the locking mechanism in the thimble. Manifestly therib, which forms the direct locking connection might be of any othercross section and fit a corresponding cavity in the spindle.

We do not limit ourselves in respect of any of the particular formsshown, the essential part of our invention consisting in the springcatch combined with the knob, and arranged to engage with holes or kerfsin the spindle. These kerfs may be made to cover the ordinary extent ofadjustment, but in finer degree than is possible, with the ordinaryscrew, since the catch is narrow, and the holes or kerfs correspondthereto. The catch may be drawn and held out of engagement byinserting aknife edge or even the thumb or finger nail, under the cap. Theconstruction allows the knob to be adjusted closely to the door, and tobe readily attached or detached.

We claim 1. In combination with the shank of a door knob, having a screwthreaded opening transversely thereof,,athimble screw threaded to fitsaid opening and carrying a spring catch adapted to engage the spindle,substantially as described.

2. In combination with the spindle having a series of holes and with theshank, a threaded thimble having a spring catch, the stem of which catchextends through the top of the thirnble, and locking devices betweensaid cap and thimble said thimble being fitted In testimony whereof weaffix oursignatures to the shank, substantially as described. inpresence of two witnesses. 3. In combination with the spindle havin -1 aseries of holes or kerfs the knob shank, th e gg ggg 'ggg 5 thimble, thecatch adapted to engage with notches in the spindle, the stem of thecatch WVitnesses: and a stud engaging with a kerf in the thim- HENRY E.COOPER,

ble, substantially as described. WALTER DONALDSON.

